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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>New method for INA bearing heating device New method for INA bearing heating device
There are two common ways to replace INA bearings: one is to directly heat the bearing with acetylene oxygen, the other is to use oil immersion heating for small bearings; to reach thermal expansion; to expand the inner diameter of the bearing; It has been widely used in long-term equipment repair; it is fundamentally satisfactory and has dealt with the bearing device problems in equipment repair. But these two methods can ensure the uniformity of the temperature value of the heated area of ​​the bearing during the heating process; it is difficult to determine. Because the traditional acetylene oxygen heating is a single gas burner; and the heating process is only experienced; how much temperature is applied to the heated bearing temperature is difficult to grasp. The temperature is too high; the bearing will be annealed; the bearing will be lowered Mechanical properties, temperature is too low; thermal expansion value is not good; difficult to install. In equipment repair; repairers sometimes do not heat the bearings; INA bearings can not be installed in the correct orientation; must have been forced to reload; then increased labor Strength. To this end; we have proposed a modification to the traditional pair of bearings. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. Electric heating instead of acetylene oxygen heating. The plane electric furnace is depicted as a cylindrical electric furnace; named as INA bearing electric heater; according to different bearing inner diameter can be described as different power and standard bearing electric heater ( The best application range is φ300mm/above bearing diameter. This heating equipment has the following advantages: uniform heat radiation and stability; smoked dust on the outside of the heated bearing, hygienic and clean; easy to measure and control the temperature of the INA bearing.
2. The infrared thermometer is used to monitor the temperature of the heated INA bearing. The heating value of the bearing device is usually controlled at 100 °C ~ 120 °C. Within this temperature value; the thermal expansion value of the bearing steel is the largest; easy to INA bearing device; This temperature value does not change the mechanical properties of the bearing; and the reliability is high.
In summary, the INA bearing electric heater is superior to the traditional acetylene oxygen heating; it is a useful method to improve the precision and working efficiency of the bearing device and reduce the labor intensity.
1. One way to improve the accuracy of INA bearings is to produce a beautiful instrument; the main shaft uses the 6202/P2 type bearing and its accuracy is still not satisfactory; the rear journal is thickened and the raceway is made on it to replace the inner ring; Fine measurement; every three sets of scales; each set of steel balls takes a distance of nearly 120°; because it adds a heavy processing appearance; it adds a cooperation appearance; together, it has improved the shaft and INA bearing system. Stiffness; and the maximum three particles and the smallest three steel balls are nearly equidistantly spread; the axis reversal accuracy is improved; so the accuracy requirement of the instrument is satisfied.
2. Accuracy improvement method INA bearing in the host after the end of the device; such as measuring the radial runout of the spindle; can be found that each of the measured values ​​have a certain change, measured in succession; can be found after passing a certain number of revolutions; this change It will be approximately repeated. The target for measuring the degree of change is the cycle rotation precision; changing the number of revolutions required for approximately repeated presentation represents the "quasi-period" of the cycle rotation accuracy; the magnitude of the magnitude change in the quasi-period is large; That is, the cycle rotation accuracy is poor.
For example, the preload is properly applied to the main shaft; the rotational speed is gradually reduced to the near-responsible rotational speed; the "run-in" effect of the INA bearing is implemented; the cyclic rotation accuracy of the main shaft can be improved.
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Source: China Bearing Network Time: 2014-09-18